And sigmund berg



(No Model.) Y I T. A. EDISON 85 S. BERGMANN.

TELEPHONE.

No. 337,254. Patented Mar. 2, 1886.

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UNITED STATES PATENT Gaston.

THOMAS A. EDISON,.OF MENLO PARK, new JERSEY, AND SIGMUND BERG- MANN, OF NEW YORK, N. Y.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 337,254, dated March 2, 186. Application filed November 13, 1883. Serial No. 111,644. (No model.)

To all whom it may concern: liquid within the instrument, preventing es- Be it known that we, THOMAS A. EDIsoN, cape or evaporation. The contact-points are ot'Menlo Park, in the county of Middlesex and located, preferably, outside of the liquid, as State of N ew J ersey,and SIGMUND BERGMANN, shown in 1. A platinum contact'point,

of New York, in the county and State of New 0, is carried by the front of the diaphragm, and 5 York, have invented a certain new and useful against it bearsa contact-point, d, of platinum, Improvement in Telephones, of which the folcarried by a screw, D. This screw is supported lowing is a specification. rigidly in the bridge e within the front A of The object of our inventionis to produce atelthe case, and is adjusted by spindle E. To

ephone-transmitter in which metallic contactclose up the telephone and prevent the saliva 60 points are effectively employed in the transfrom reaching the contact-points, a second diamission of articulate speech. \Ve accomplish phragm, F, may be employed, held in place by this by the use of a diaphragm, metallic electhe mouthpiece G. In the transmitter shown trodes affected by the movements thereof, and in Fig. 3, the contact-points being within the I 5 a body of liquid limiting the movement of said chamber 0 and protected thereby, there is no 6 5- diaphragm, and thereby limiting and controlneed of the second diaphragm. The electrical ling the separation of the electrodes. The connections, it will be seen, are made so as to liquid body, by preventing an excessive movebring the contacts into the circuit, one with ment of the diaphragm, prevents theelectrodes the case and the other with the diaphragm;

from moving too far, so that they quickly rebut it will be understood that if a diaphragm 7o turnto their normal position,andall the soundof insulating material such as mica is used, vibrations are responded to from the normal instead of one of metal, as shown, one connecposition of the electrodes. The liquid body is tion will run directly to the contact-point carpreferably of oil, but may be of any other liqried by the diaphragm.

uidmercury, for instance. WVe prefer to e are aware that it has been proposed to place the body ofliquid behind the diaphragm, provide a telephone-transmitter having carbon between it and the rigid inclosing-case of the electrodes with a hydrostatic column pressing instrument, and the electrodes on the side of the electrodes together and toward the diathe diaphragm opposite the liquid that is bephragm; but the movement of the diaphragm o tween the diaphragm and the mouthpiece. in a direction to separate the contacts would One of said electrodes is preferably carried not be limited by such a construction. directly by said diaphragm and the other sup WVe are also aware that battery-telephones ported rigidly from the case of the instrument. have been proposed wherein the diaphragm An outer protecting-diaphragm may be emwould form one plate of a galvanic battery and 35 ployed at the mouth-piece, if desired. would be separated from the other battery In the accompanying drawings, forming a plate by the exciting-liquid, the distance bepart hereof, Figure l is avertical section of a tween the battery-plates being varied by the telephone-transmitter embodying our invenmovements of the'diaphragm.

tion; Fig. 2, a front elevation of the instru- 'What we claim is- 0 ment with the mouth-piece removed, and Fig. 1. In a telephone-transmitter, the combina- 9o 3avertical section of a modified form of transtion, with a diaphragm and electrodes conmitter. trolled thereby, of a body of liquid connected A A are the two parts of a suitable case, with and limiting the movement of said diapreferably of metal, within which is held the phragm, substantially as set forth.

5 diaphragm B. This diaphragm is clamped 2. In a telephone-transmitter, the combinabetween packing-rings a, by which it is insution, with a diaphragm and metallic electrodes lated from the case, and by which a closed controlled thereby, of a body of liquid conchamber, 0, is formed back of the diaphragm. nected with and limiting the movement of said The chamber 0 is filled with a liquid through diaphragm, substantially as set forth.

50 the tube b, which is closed so as to seal the 3. In a telephone-transmitter, the combinatoo tion, with a diaphragm and electrodes in direct contact controlled thereby, of a body of liquid behind said diaphragm and covering the active surface thereof, substantially as set forth.

4. In a telephone-transmitter, the combination of a diaphragm, a body of liquid behind said diaphragm, and two electrodes, one of which is carried by said diaphragm on the side opposite the liquid, substantially asset forth.

5. In a telephone-transmitter, the combination of a diaphragm, a body of liquid behind said diaphragm, and two electrodes on the opposite side of the diaphragm from the liquid, one carried by said diaphragm, the other independent thereof, substantially as set forth.

6. In a telephone-transmitter, the combination of a diaphragm, a body of liquid behind it, electrodes affected by said diaphragm situated between the diaphragm and mouth-piece,

and an outer diaphragm protecting the elcctrodes, substantially as set forth.

7. In atelephone-transmitter, the combina- THOMAS A. unison. SIGMUND BERGMANN.

Witnesses:

P. H. KLEIN, J r., RIOHD. N. DYER. 

